. >> but have we been able to meet our needs with hetch hetchy with our parr? >> there have been times we had to meet short-term purchases in order to meet our needs. and maybe the best way to look at that is to again look at the first background slide i put up where you can see there are some years where a lot of our generation is considerably lower. you could tell that our retail sales pretty much track a wet year. not exactly, but in recent years, sorry, they pretty much track a dry year. so, the dry year line you see on this slide here is about where our retail sales are or have been in the last 10 or so years. and, so, looking at these -- the tail end of this slide here, you can see although years we have plenty of power to cover our retail sales. >> so, one of the things this slide doesn't give you is sort of like that day to day sort of variation that happens. that's an annual sort of like slide. and when you look at it sort of by quarter or by month, great, you have lots of power in april, may, june, and you have very little in september, october, novem